公开(公告)号：JPH1041071A

公开(公告)日：1998-02-13

申请号：JP8633697

申请日：1997-04-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DODABALAPUR ANANTH ,  MILLER TIMOTHY MARK ,  LEWIS JOSIAH ROTHBERG

IPC: H01L51/50 ,  H01L51/52 ,  H05B33/02 ,  H05B33/12 ,  H05B33/22 ,  H05B33/24 ,  H05B33/14

Abstract: PROBLEM TO BE SOLVED: To reduce deviation in a wavelength of an emitted light associated with a change in the field of view by forming a micro-cavity layer on a substrate. SOLUTION: A uniform micro-cavity layer structure 15 of a light emitting device is formed on a conical portion of a substrate 42. Light is radiated through a bottom surface 43 of the substrate 42. The wedge angle ψ of a conical portion 42b is relatively small as 8-15 degrees. The layer structure 15 is the same as that of a planar light emitting device and the thickness and the refractive index of each layer affect the emitted light spectrum in the direction normal to each zone of the layer structure 15. Light emission as seen from a distant field of view at each angle of Θ on the X-Y plane is approximated by addition of light emissions from opposing portions 15a, 15b of the layer structure 15. Therefore, the portions 15a, 15b may be deemed as two planar light emitting devices disposed obliquely to each other. It is understood due to its shape that a change in a wavelength associated with a sight angle is reduced by the addition of spectrum.